\documentclass[10pt]{article} % required
\pagestyle{empty} % required
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{color}
\usepackage[T1]{fontenc}

\begin{document}\definecolor{fgC}{rgb}{0,0,0}\color{fgC}\[\begin{matrix}
R = c_p - c_v \\
\gamma = \frac{c_p}{c_v}\\
e = c_v T \\
h = c_p T
\end{matrix}\]\end{document}